A person aged 16 or over (A) (subject to subsection (3A)) commits an offence if—
The ways that A may be related to B are as parent, grandparent, child, grandchild, brother, sister, half-brother, half-sister, uncle, aunt, nephew or niece.
In subsection (2)—
Where subsection (1) applies in a case where A is related to B as B's child by virtue of subsection (3)(zb), A does not commit an offence under this section unless A is 18 or over.
Where in proceedings for an offence under this section it is proved that the defendant was related to the other person in any of those ways, it is to be taken that the defendant knew or could reasonably have been expected to know that he was related in that way unless sufficient evidence is adduced to raise an issue as to whether he knew or could reasonably have been expected to know that he was.
A person guilty of an offence under this section is liable—
Nothing in—
is to be read as preventing the application of section 39 of the Adoption Act 1976 or section 67 of the Adoption and Children Act 2002 for the purposes of subsection (3)(za) and (zb) above.